Combined electric and photocontrol of selective light reflection at an oblique helicoidal cholesteric liquid crystal doped with azoxybenzene derivative

被引：24

作者：

Thapa, Kamal ^{[1
,2
]}

Iadlovska, Olena S. ^{[1
,2
]}

Bisoyi, Hari Krishna ^{[1
]}

Paterson, Daniel A. ^{[3
]}

Storey, John M. D. ^{[3
]}

Imrie, Corrie T. ^{[3
]}

Li, Quan ^{[1
,4
]}

Shiyanovskii, Sergij, V ^{[1
,4
]}

Lavrentovich, Oleg D. ^{[1
,2
,4
]}

机构：

[1] Kent State Univ, Adv Mat & Liquid Crystal Inst, Kent, OH 44242 USA

[2] Kent State Univ, Dept Phys, Kent, OH 44242 USA

[3] Univ Aberdeen, Sch Nat & Comp Sci, Dept Chem, Aberdeen AB24 3UE, Scotland

[4] Kent State Univ, Mat Sci Grad Program, Kent, OH 44242 USA

来源：

PHYSICAL REVIEW E | 2021年 / 104卷 / 04期

关键词：

TRANSITION; MIXTURES; DRIVEN; PITCH;

D O I：

10.1103/PhysRevE.104.044702

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

An oblique helicoidal cholesteric liquid crystal ChOH represents a unique optical material with a singleharmonic periodic modulation of the refractive index anda pitch that can be tuned by an electric or magnetic field in a broad range from submicrometers to micrometers. In this work, we demonstrate that the oblique helicoidal cholesteric doped with azoxybenzene molecules can be tuned by both the electric field and light irradiation. The tuning mechanism is explained by the kinetics of trans-cis photoisomerization of the azoxybenzene molecules. At a fixed voltage, UV irradiation causes a redshift of the reflection peak by more than 200 nm. The effect is caused by an increase of the bend elastic constant of ChOH under irradiation. The demonstrated principle has the potential for applications such as smart windows, sensors, tunable lasers, and filters.

引用

页数：9

共 59 条

[1] Color change effect based on provitamin D phototransformation in cholesteric liquid crystalline mixtures [J].